JavaScript resides inside HTML documents, and can provide levels of interactivity far beyond typicallly flat HTML pagess -- without the need for serveral-based CGI (Common Gateway Interface) programs.

Java is completely different from JavaScript. Java is a lot more powerful, more complex, and a lot harder to learn. It is important to understand that a Java-enabled browser is not automatically a JavaScript-enabled browser: the two technologies require entirely seperate interpreters to handle the languages.